<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 2002-2-1 (1.71) original version by: Nikos Drakos, CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>6.4.7 Van der Grinten projection (-Jv -JV)</TITLE> <META NAME="description" CONTENT="6.4.7 Van der Grinten projection (-Jv -JV)"> <META NAME="keywords" CONTENT="GMT_Docs"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META NAME="Generator" CONTENT="LaTeX2HTML v2002-2-1"> <META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"> <LINK REL="STYLESHEET" HREF="GMT_Docs.css"> <LINK REL="previous" HREF="node119.html"> <LINK REL="up" HREF="node113.html"> <LINK REL="next" HREF="node121.html"> </HEAD> <BODY bgcolor="#ffffff"> <!--Navigation Panel--> <A NAME="tex2html4306" HREF="node121.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html4300" HREF="node113.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html4296" HREF="node119.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html4302" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <A NAME="tex2html4304" HREF="node256.html"> <IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="index.png"></A> <BR> <B> Next:</B> <A NAME="tex2html4307" HREF="node121.html">7. Creating GMT Graphics</A> <B> Up:</B> <A NAME="tex2html4301" HREF="node113.html">6.4 Miscellaneous projections</A> <B> Previous:</B> <A NAME="tex2html4297" HREF="node119.html">6.4.6 Sinusoidal projection (-Ji</A> <B> <A NAME="tex2html4303" HREF="node1.html">Contents</A></B> <B> <A NAME="tex2html4305" HREF="node256.html">Index</A></B> <BR> <BR> <!--End of Navigation Panel--> <H2><A NAME="SECTION001447000000000000000"> 6.4.7 Van der Grinten projection (<B>-Jv</B> <B>-JV</B>)</A> </H2> <P> <A NAME="22599"></A> <A NAME="22600"></A> <A NAME="22601"></A> <P> The Van der Grinten projection, presented by Alphons J. van der Grinten in 1904, is neither equal-area nor conformal. Central meridian and Equator are straight lines; other meridians are arcs of circles. The scale is true along the Equator only. Its main use is to show the entire world enclosed in a circle. To use it you must enter <P> <UL> <LI>The central meridian [Middle of your map]. </LI> <LI>Scale along equator in inch/degree or 1:xxxxx (<B>-Jv</B>), or map width (<B>-JV</B>). </LI> </UL> <P> Centered on the Dateline, the example below was created by this command: <P> <BR CLEAR="ALL"> <HR> <BR> <PRE>pscoast -Rg -JV4i -Bg30/g15 -Dc -Glightgray -A10000 -Wthinnest -P > GMT_grinten.ps </PRE> <BR CLEAR="ALL"> <HR> <P> <DIV ALIGN="CENTER"><A NAME="fig:GMT_grinten"></A><A NAME="23321"></A> <TABLE> <CAPTION ALIGN="BOTTOM"><STRONG>Figure 6.33:</STRONG> World map using the Van der Grinten projection.</CAPTION> <TR><TD> <DIV ALIGN="CENTER"><IMG WIDTH="463" HEIGHT="463" ALIGN="BOTTOM" BORDER="0" SRC="img154.png" ALT="\includegraphics{scripts/GMT_grinten}"></DIV></TD></TR> </TABLE> </DIV> <P> <A NAME="22602"></A> <A NAME="22603"></A> <A NAME="22604"></A> <P> <A NAME="22411"></A> <A NAME="22412"></A> <HR> <!--Navigation Panel--> <A NAME="tex2html4306" HREF="node121.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="next.png"></A> <A NAME="tex2html4300" HREF="node113.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="up.png"></A> <A NAME="tex2html4296" HREF="node119.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="prev.png"></A> <A NAME="tex2html4302" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="contents.png"></A> <A NAME="tex2html4304" HREF="node256.html"> <IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="index.png"></A> <BR> <B> Next:</B> <A NAME="tex2html4307" HREF="node121.html">7. Creating GMT Graphics</A> <B> Up:</B> <A NAME="tex2html4301" HREF="node113.html">6.4 Miscellaneous projections</A> <B> Previous:</B> <A NAME="tex2html4297" HREF="node119.html">6.4.6 Sinusoidal projection (-Ji</A> <B> <A NAME="tex2html4303" HREF="node1.html">Contents</A></B> <B> <A NAME="tex2html4305" HREF="node256.html">Index</A></B> <!--End of Navigation Panel--> <ADDRESS> Paul Wessel 2010-07-14 </ADDRESS> </BODY> </HTML>